Create organized folder structure for Kenney assets
- Added comprehensive folder structure for models, sprites, and sounds
- Created README.md guides in each folder explaining what assets go where
- Added ASSET_ORGANIZATION_GUIDE.md with step-by-step instructions
- Organized folders for:
- 3D models (characters, platforms, collectibles, obstacles, environment)
- UI sprites (icons, touch controls, panels)
- Sound effects (player, enemies, collectibles, UI, level events)
- Prepared for importing Kenney asset packs (Platformer Kit, Food Kit, Character Pack, UI Pack)
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